Regular Expressions can be very useful tools for web developers. However, they can be a bit tricky to use, especially when you are not very experienced in web or software development. Well, over at Cats who Code they have put together a list of 15 useful regular expressions for web developers. The code is written in PHP, but should be fairly easy to translate to other languages.

Below is an excerpt from the post.

For many beginners, regular expressions seems to be hard to learn and use. In fact, they're far less hard than you may think. Before we dive deep inside regexp with useful and reusable codes, let's quickly see the basics: